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Wiring Distance Chart

Wiring Distance (Measured in Feet)
6 VoltTotal Watts on Wire Run12 Volt
12 Ga10 Ga8 Ga6 Ga12 Ga10 Ga8 Ga6 Ga4 Ga
89141225357635656690014312276
66106168268826742467510731707
599415023892373776009541517
5384135214102133395408591366
4470112178121782834507151138
33538413416133212337536853
29477511918118188300477758
223556892489141225357569
213354852585135216343546
193150792779125200318505
172845713071113180286455
14233759365994150238379
12203251425180128204325
11183047454775120190303
11172844484470112178284
10162742504267108171273
711182875284572114182
58132110021335485136
-59141501422365791
--6102001016274268
--58250813213454
---7300711182845
Wiring Distance (Measured in Feet)
6 VoltTotal Watts on Wire Run12 Volt
12 Ga89612 Ga356
10 Ga14110 Ga566
8 Ga2258 Ga900
6 Ga3576 Ga1431
4 Ga-4 Ga2276
12 Ga66812 Ga267
10 Ga10610 Ga424
8 Ga1688 Ga675
6 Ga2686 Ga1073
4 Ga-4 Ga1707
12 Ga59912 Ga237
10 Ga9410 Ga377
8 Ga1508 Ga600
6 Ga2386 Ga954
4 Ga-4 Ga1517
12 Ga531012 Ga213
10 Ga8410 Ga339
8 Ga1358 Ga540
6 Ga2146 Ga859
4 Ga-4 Ga1366
12 Ga441212 Ga178
10 Ga7010 Ga283
8 Ga1128 Ga450
6 Ga1786 Ga715
4 Ga-4 Ga1138
12 Ga331612 Ga133
10 Ga5310 Ga212
8 Ga848 Ga337
6 Ga1346 Ga536
4 Ga-4 Ga853
12 Ga291812 Ga118
10 Ga4710 Ga188
8 Ga758 Ga300
6 Ga1196 Ga477
4 Ga-4 Ga758
12 Ga222412 Ga89
10 Ga3510 Ga141
8 Ga568 Ga225
6 Ga896 Ga357
4 Ga-4 Ga569
12 Ga212512 Ga85
10 Ga3310 Ga135
8 Ga548 Ga216
6 Ga856 Ga343
4 Ga-4 Ga546
12 Ga192712 Ga79
10 Ga3110 Ga125
8 Ga508 Ga200
6 Ga796 Ga318
4 Ga-4 Ga505
12 Ga173012 Ga71
10 Ga2810 Ga113
8 Ga458 Ga180
6 Ga716 Ga286
4 Ga-4 Ga455
12 Ga143612 Ga59
10 Ga2310 Ga94
8 Ga378 Ga150
6 Ga596 Ga238
4 Ga-4 Ga379
12 Ga124212 Ga51
10 Ga2010 Ga80
8 Ga328 Ga128
6 Ga516 Ga204
4 Ga-4 Ga325
12 Ga114512 Ga47
10 Ga1810 Ga75
8 Ga308 Ga120
6 Ga476 Ga190
4 Ga-4 Ga303
12 Ga114812 Ga44
10 Ga1710 Ga70
8 Ga288 Ga112
6 Ga446 Ga178
4 Ga-4 Ga284
12 Ga105012 Ga42
10 Ga1610 Ga67
8 Ga278 Ga108
6 Ga426 Ga171
4 Ga-4 Ga273
12 Ga77512 Ga28
10 Ga1110 Ga45
8 Ga188 Ga72
6 Ga286 Ga114
4 Ga-4 Ga182
12 Ga510012 Ga21
10 Ga810 Ga33
8 Ga138 Ga54
6 Ga216 Ga85
4 Ga-4 Ga136
12 Ga-15012 Ga14
10 Ga510 Ga22
8 Ga98 Ga36
6 Ga146 Ga57
4 Ga-4 Ga91
12 Ga-20012 Ga10
10 Ga-10 Ga16
8 Ga68 Ga27
6 Ga106 Ga42
4 Ga-4 Ga68
12 Ga-25012 Ga8
10 Ga-10 Ga13
8 Ga58 Ga21
6 Ga86 Ga34
4 Ga-4 Ga54
12 Ga-30012 Ga7
10 Ga-10 Ga11
8 Ga-8 Ga18
6 Ga76 Ga28
4 Ga-4 Ga45
Maximum Voltage Drop 5%



Key to Longer Wire Runs

The Wiring Distance Chart gives the maximum length of a given remote lamp circuit, assume the entire remote load is concentrated at the end of the wire run.

If remote lamp fixtures are uniformly spaced along the circuit path (equal watts spaced at equal distance), the lengths in the table may be increased, based on the chart and formula below:


# of fixtures
23456N
1.331.51.61.671.712N/(N+1)



MULTIPLY FEET BY

For example, a 100-foot long, 12-volt, remote lamp circuit has four 12-watt fixtures spaced 25 feet apart. According to the Wire Distance Chart, #8 Ga. wire would be required for 48 total watts up to 112 feet, to allow a 5% voltage drop or less. However, since the fixtures are equal in wattage and are spaced equally along the circuit, the distance of 70 feet for #10 Ga. wire can be multiplied by 1.6 (70 x 1.6 = 112), so in this case up to a 112-foot wire run with #10 Ga. wire would be acceptable.
Note: For systems operating at less than 50 volts, the smallest permissible wire size is #12 Ga. copper or equivalent per NFPA70 (National Electrical Code), Article 720-4.